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Application of a coelostat daylighting system for energy savings and enhancement of indoor illumination: A case study under clear-sky conditions

机译：腔恒光器采光系统在节能和增强室内照明中的应用：在晴朗天空条件下的案例研究

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This paper examines the effectiveness of coelostat daylighting systems for enhancing the indoor visual environment of open-plan offices. A coelostat consists of a movable mirror capable of tracking the sun and a fixed second mirror, which, acting together, create a single beam of sunlight for daylighting. A series of computer simulations were carried out using TracePro and Radiance where the relevant IES output (polar candela distribution plots) of the former was exported to the latter for photometric analyses. The results reveal that coelostat daylighting systems can significantly enhance not only the visual environment but also the energy efficiency when sufficient daylight is introduced by simultaneously applying side and top daylighting (ST) schemes. When only daylight admitted through windows is considered, daylight availability varies from 0.12% (at 10 a.m., summer solstice) to 3.19% (at 12 p.m., winter solstice). In contrast, the highest daylight availability of 3.41% is observed at 12 p.m. on the day of the winter solstice when side and top lighting are considered in addition to daylight admitted through windows. Electricity savings of 1.78 kWh are estimated over a period of one hour around noon, that is, a half an hour before and after noon. A comparison between the on-site measured data and simulated values showed that they were in good agreement, confirming the reliability of the computer modeling developed in this work. The approach described here could be extended to analyze daylighting performance of buildings with similar solar features, such as light wells. (C) 2017 Elsevier B.V. All rights reserved.
机译：本文研究了coelostat日光系统对增强开放式办公室的室内视觉环境的有效性。定日镜由一个能够跟踪太阳的可移动镜和一个固定的第二镜组成，后者共同作用，产生一束日光用于采光。使用TracePro和Radiance进行了一系列计算机模拟，其中前者的相关IES输出（极性坎德拉分布图）被输出到后者进行光度分析。结果表明，通过同时应用侧面和顶部采光（ST）方案，当引入足够的采光量时，定腔恒温器采光系统不仅可以显着提高视觉环境，而且可以显着提高能源效率。如果仅考虑通过窗户允许的日光，则夏令时的可用率从0.12％（夏至10时）到3.19％（夏至12时）不等。相反，在下午12点观察到最高的日光利用率为3.41％。在冬至的那天，除了通过窗户进入的日光外，还考虑了侧面和顶部照明。估计在中午前后一小时左右（即中午前后半小时）内可节电1.78千瓦时。现场测量数据与模拟值之间的比较表明，它们具有良好的一致性，从而确认了这项工作中开发的计算机建模的可靠性。此处描述的方法可以扩展为分析具有类似太阳能特征的建筑物的日光性能，例如光井。 （C）2017 Elsevier B.V.保留所有权利。

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